I have suggested my mother to use Ubuntu (16.04) because she is likely to get viruses while using Windows. She agreed but gave one condition: "I must be able to watch TV-players online", and these are (both using Silverlight):

Pipelight claims to be able to install and run (Windows) Silverlight, but I've never had success with it. Your mileage may vary.

When it works, Pipelight uses Wine to run Windows browser plugins in support of Linux browsers, wrapping the plugin so the browser can use it. This is likely to be useless now, however, because Firefox has completely dropped the NPAPI some time ago, and Pipelight (last time I checked) used that interface to provide services from Windows plugins.